Example usage for java.util Random nextBytes

Introduction

In this page you can find the example usage for java.util Random nextBytes.

Prototype

public void nextBytes(byte[] bytes)

Source Link

Document

Generates random bytes and places them into a user-supplied byte array.

Usage

From source file:de.mpg.escidoc.services.aa.TanStore.java

/**
 * Generate a random transaction number.
 * /*from   w w  w  .  j  av  a  2 s . c o m*/
 * @param id The session id.
 * @return a random transaction number
 */
public static String createTan(String id) {
    Random random = new Random(new Date().getTime());

    byte[] tanBytes = new byte[16];

    random.nextBytes(tanBytes);

    return new String(Base64.encodeBase64(tanBytes));
}

From source file:org.apache.hadoop.hdfs.protocol.RandomObjectsGenerators.java

static byte[] rndByteArr(Random rnd, int count) {
    byte[] bytes = new byte[count];
    rnd.nextBytes(bytes);
    return bytes;
}

From source file:org.jahia.utils.zip.DirectoryZipInputStreamTest.java

@BeforeClass
public static void oneTimeSetUp() {
    tempDirectory = FileUtils.getTempDirectory();
    outputDirectory = new File(tempDirectory, "dirzip-dest-" + System.currentTimeMillis());
    outputDirectory.mkdirs();//from  w  w w .  j  a v a 2 s  . c o  m

    Random random = new Random();
    random.nextBytes(randomBuffer);
}

From source file:org.apache.hadoop.hbase.util.test.LoadTestKVGenerator.java

/**
 * Generates random bytes of the given size for the given row and column
 * qualifier. The random seed is fully determined by these parameters.
 *///w ww .j a v a  2 s  .c  o m
private static byte[] getValueForRowColumn(int dataSize, byte[]... seedStrings) {
    long seed = dataSize;
    for (byte[] str : seedStrings) {
        seed += Bytes.toString(str).hashCode();
    }
    Random seededRandom = new Random(seed);
    byte[] randomBytes = new byte[dataSize];
    seededRandom.nextBytes(randomBytes);
    return randomBytes;
}

From source file:org.apache.hadoop.fs.TestListFiles.java

private static void writeFile(FileSystem fileSys, Path name, int fileSize) throws IOException {
    // Create and write a file that contains three blocks of data
    FSDataOutputStream stm = fileSys.create(name);
    byte[] buffer = new byte[fileSize];
    Random rand = new Random(seed);
    rand.nextBytes(buffer);
    stm.write(buffer);//from w w w . j a  va  2s  .  c  om
    stm.close();
}

From source file:org.apache.hadoop.hbase.util.LoadTestKVGenerator.java

/**
 * Generates random bytes of the given size for the given row and column
 * qualifier. The random seed is fully determined by these parameters.
 *//*  ww w  . j a  v a2 s .c o m*/
private static byte[] getValueForRowColumn(int dataSize, byte[]... seedStrings) {
    long seed = dataSize;
    for (byte[] str : seedStrings) {
        final String bytesString = Bytes.toString(str);
        if (bytesString != null) {
            seed += bytesString.hashCode();
        }
    }
    Random seededRandom = new Random(seed);
    byte[] randomBytes = new byte[dataSize];
    seededRandom.nextBytes(randomBytes);
    return randomBytes;
}

From source file:com.g414.dgen.field.Fields.java

/**
 * returns some random Hex bytes : note, length is of "original" binary
 * bytes//from w ww .  java 2 s.  c  o  m
 */
public static Field<String> getRandomHexBytesField(final String name, final int length) {
    return new Field<String>() {
        @Override
        public String getName() {
            return name;
        }

        @Override
        public String getValue(String entityId, Map<String, Object> entitySoFar, Random random) {
            byte[] next = new byte[length];
            random.nextBytes(next);

            return Hex.encodeHexString(next);
        }
    };
}

From source file:com.g414.dgen.field.Fields.java

/** returns some random bytes */
public static Field<byte[]> getRandomBinaryField(final String name, final int length) {
    return new Field<byte[]>() {
        @Override/*w  w  w.ja v  a 2  s .  c om*/
        public String getName() {
            return name;
        }

        @Override
        public byte[] getValue(String entityId, Map<String, Object> entitySoFar, Random random) {
            byte[] next = new byte[length];
            random.nextBytes(next);

            return next;
        }
    };
}

From source file:com.asquareb.kaaval.MachineKey.java

/**
 * Method to encrypt a string. Accepts the string to be encrypted and the
 * name of the file to store the key vale which can be used for decryption
 *//*from www.j  av a  2  s .com*/
public static String encrypt(String property, String app) throws IOException, KaavalException {

    InetAddress ip = null;
    String ipAddress = null;
    ObjectOutputStream os = null;
    NetworkInterface macAddress = null;
    byte[] macId = null;
    Cipher pbeCipher = null;
    Random rand = new Random();
    rand.nextBytes(salt);
    try {
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
        SecretKey key = keyFactory.generateSecret(new PBEKeySpec(password));
        ip = InetAddress.getLocalHost();
        ipAddress = ip.getHostAddress();
        macAddress = NetworkInterface.getByInetAddress(ip);
        macId = macAddress.getHardwareAddress();
        MachineKey mKey = new MachineKey();
        mKey.api = ipAddress;
        mKey.macad = new String(macId);
        mKey.yek = key;
        mKey.tlas = salt;
        mKey.eti = rand.nextInt(1000);
        os = new ObjectOutputStream(new BufferedOutputStream(new FileOutputStream(app)));
        os.writeObject(mKey);
        os.close();
        pbeCipher = Cipher.getInstance("PBEWithMD5AndDES");
        pbeCipher.init(Cipher.ENCRYPT_MODE, key, new PBEParameterSpec(salt, mKey.eti));
        return base64Encode(pbeCipher.doFinal(property.getBytes()));
    } catch (IOException e) {
        throw new KaavalException(1, "Error in key file during encryption", e);
    } catch (Exception e) {
        throw new KaavalException(2, "Errors during encryption", e);
    } finally {
        if (os != null)
            os.close();
    }
}

From source file:org.apache.kylin.storage.hbase.util.HbaseStreamingInput.java

private static byte[] randomBytes(int lenth) {
    byte[] bytes = new byte[lenth];
    Random rand = new Random();
    rand.nextBytes(bytes);
    return bytes;
}